Navigating from one UITableView to another inside appDelegate - objective-c

Question

The first UITableView is presented inside a Popover that is called from the RootViewController of the application.
I need to navigate to another UITableView inside the same popover. This is easy to do if you just instance an object of the second UITableView and push it from the first one.
In the next paragraph I write as taking for granted some facts, please correct me if I'm wrong.
The problem here is that this process should be done inside the appDelegate. This is because I'm implementing Dropbox API and I need the pushViewController to be done immediately after the login process is done, which means the navigation through UITableViews has to be done inside of the application:handleOpenURL. I asume that application:handleOpenURL has to be called right there and that's why I also asume the pushViewController has to be done there in order to have the navigation done after the Dropbox API validation window is presented, without having to make the user do anything else.
This is how my code looks like:
AppDelegate.h
#interface AppDelegate : NSObject <UIApplicationDelegate>{
UINavigationController *navigationController;
NSString *relinkUserId;
UIWindow *window;
TableViewControllerForStorageList *rootViewController;
ViewController *viewController;
}
#property (nonatomic, strong) IBOutlet UIWindow *window;
#property (nonatomic, strong) IBOutlet UINavigationController *navigationController;
#property (nonatomic, strong) IBOutlet TableViewControllerForStorageList *rootViewController;
#property (nonatomic, strong) IBOutlet ViewController *viewController;
AppDelegate.m
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
if ([[DBSession sharedSession] handleOpenURL:url]) {
if ([[DBSession sharedSession] isLinked]) {
[(TableViewControllerForStorageList *)self.window.rootViewController PushView];
}
return YES;
}
return NO;
}
TableViewControllerForStorageList.h
-(void)PushView;
TableViewControllerForStorageLost.m
-(void)PushView
{
TableViewControllerIpadStorage *tableViewControllerIpadStorage = [[TableViewControllerIpadStorage alloc]initWithNibName:#"TableViewControllerIpadStorage" bundle:Nil];
[self.navigationController pushViewController:tableViewControllerIpadStorage animated:YES];
}
Off course I got sure that Application:HandleOpenURL is running, but when calling PushView from there the error is [ViewController PushView]: unrecognized selector sent to instance
So, how can make the navigation be done from there? Which basics about objective c am I missing?

Answer 1

It is not clear from your question how your app is structured, so this answer may not be the best solution for your problem but hopefully it gives you some idea of how your view controller hierarchy is likely built up from your app delegate.
Lets say your first view controller class is named FirstViewController. Either your app delegate has a direct reference to an instance of this view controller, or it can access it through a parent view controller (perhaps via window.rootViewController).
Now lets say you have a method in FirstViewController named pushNextViewController that performs the task of pushing the second table view controller.
You can call that method from within the application:handleOpenURL: method of your app delegate.
This might look something like:
[self.window.rootViewController.firstViewController pushNextViewController];
There are other ways you could get a reference to your instance of FirstViewController and it would be cleaner if your rootViewController was a custom subclass so your could create a pushNextViewController method there and from that method tell your FirstViewController instance to pushNextViewController:
[self.window.rootViewController pushNextViewController];
Note that in both examples above, you will need to cast the rootViewController to whatever class it is actually an instance of or the compiler will warn you that it does not have the property firstViewController (example 1) or the method pushNextViewController (example 2).
EDIT: If your rootViewController is a UINavigationController, then your code might look more like:
UINavigationController* navController = (UINavigationController*)window.rootViewController;
FirstViewController* vc = navController.viewControllers[0];
[vc pushNextViewController];
EDIT 2: OK, It looks like the confusion here is that the window object has a rootViewController property (which appears to be pointing to your navigationController) and then you also have a rootViewController instance variable in your app delegate. These are two different objects, making your naming convention a bit confusing, but if I am right then the following should work:
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
if ([[DBSession sharedSession] handleOpenURL:url]) {
if ([[DBSession sharedSession] isLinked]) {
[rootViewController PushView];
}
return YES;
}
return NO;
}
You should consider changing the name of your app delegate's reference to your TableViewControllerForStorageList to something other than rootViewController to alleviate some confusion.